My Cortina runs thru the gears up to speed without missing a beat, but once doing 65-70 put foot down and under load it starts missing and backfiring. Let out of the gas a little giving it less load and it increases speed. I have checked wires, plugs, put a new distributor in it as the old one had a little movement in the shaft. It has Pertronix LS module with a pertronix coil. Any suggestions.
Thanks
Engine Missing and popping under load
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- Posts: 455
- Joined: Tue Dec 20, 2011 7:54 pm
- Location: Novato Ca
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- Posts: 1829
- Joined: Sun Sep 16, 2012 12:42 pm
- Location: Vancouver British Columbia Canada
It is a bit difficult to diagnose from afar as there can be a few things that cause that sort of thing. Did it just come on suddenly or had you made some sort of change beforehand? High speed in top gear puts a fair load on when you give it throttle, fuel demand is up and a weak spark can show its face then too. I have heard of the Pertronix stronger spark causing problems arcing through standard rotors so check that and the cap too.
As I said many things can cause it, I once had a situation where my voltage regulator caused my car to miss like hell only when I gave it a high load. I measured the voltage and it kept going up to the point where the points/condenser could not handle it, soon as I disconnected the alternator the problem vanished although it is very unlikely this is what is happening to you. Keep checking.
As I said many things can cause it, I once had a situation where my voltage regulator caused my car to miss like hell only when I gave it a high load. I measured the voltage and it kept going up to the point where the points/condenser could not handle it, soon as I disconnected the alternator the problem vanished although it is very unlikely this is what is happening to you. Keep checking.
Anglia 100e modified
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Prefect 100e stock